Basf Aktiengesellschaft

Badische Anilin- & Soda-fabrik Aktiengesellschaft

Udo Haardt

Hermann Tatzel

Erhard Seiler

Friedrich Domas

Rudolf Gaeth

Fritz Stastny

Werner Lenz

Isidoor De Grave

Harald Schwager

Wolfram Koegel

Klaus-Dieter Ruempler

Rainer Henning

Norbert Jung

Heinz-Hermann Koerner

Fritz E Krueckau

Juergen Hamprecht

Hans Georg Trieschmann

Moldings made from polyolefin particle foams having a mean density of from 0.015 to 0.100 g/cm.sup.3 and having at least two different regions whose densities differ by from 0.005 to 0.030 g/cm.sup.3 have a transition zone between the different density regions having a thickness of not more than 25 mm. A method of forming the moldings, using removable mold dividing walls, is described.

Method of forming foam moldings having varied density regions

A component having a virtually rectangular force-displacement characteristic line and comprising an elongated polymer foam block (1) of rectangular cross-section having sides a and b and having a recess (2) of width d and depth c extending along the entire length of the block on one side, said dimensions satisfying certain equations.

Component for absorbing impact energy

A shock-absorbing propylene polymer composite molding contains

Shock-absorbing propylene polymer composite moldings

Moldings made from polyolefin particle foams having a mean density of from 0.015 to 0.100 g/cm.sup.3 and having at least two different regions whose densities differ by from 0.005 to 0.030 g/cm.sup.3 have a transition zone between the different density regions having a thickness of not more than 25 mm.

Foam moldings having various density regions, the production thereof,

A recyclable bumper system based on polypropylene comprises a bumper support A of glass fiber reinforced polypropylene, an energy-absorbing foam core B of foamed polypropylene and a tough shell C of EP-rubber modified polypropylene which may be coated, and can be recycled by mechanical comminution, extrusion and granulation, resulting in granules from which injection moldings having good mechanical properties can be produced.

Recyclable bumper system

Foam particles of propylene polymers which have shrunk from 40 to 95% of their original volume and have a bulk density of from 10 to 30 g/1 can be expanded if they are treated with air or nitrogen under superatmospheric pressure, subsequently decompressed. If desired post-foamed by heating and, after aging, re-treated with air or nitrogen under superatmospheric pressure, subsequently decompressed and aged under atmospheric pressure until the pressure in the cells has dissipated.

Expansion of shrunk foam particles of propylene polymers

Composite soft and resilient foams are manufactured by injecting a foamable mixture of polyisocyanates, polyols, water or inert blowing agents and, if appropriate, auxiliaries, under pressure into a mold of which about 90 to 30% of the volume is filled with foamed, soft and resilient particles of olefin polymers of particle size from about 3 to 50 mm and bulk density from 5 to 100 g/l -- these particles being in loose form or fused or stuck together -- and allowing the reaction mixture to foam up.

Manufacture of soft and resilient foams

Manufacture of molded articles of foamed ethylene copolymers containing, attached to the polymer chain, substituents having Zerewitinoff-active hydrogen atoms, and a binder mix containing isocyanate groups, wherein the components are mixed and the mixture is compressed in molds to from 80 to 20% of its original bulk volume and is cured under pressure.

Growing community of inventors

Biblis, Germany

Udo Haardt